16739-InstructionSheet Rev-3-11-2011
Derale Performance, Los Angeles, CA 800.421.6288 www.derale.com
INSTALLATION INSTRUCTIONS
SINGLE STAGE ELECTRIC FAN THERMOSTAT
PART # 16739
(Continues on reverse side)
THERMOSTAT PROBE INSTALLATION
RELAY WIRE HARNESS MOUNTING
Placement: generally
Installation:
NOTE:
Locate a 3/8” NPT port on the vehicle, found on
the vehicles radiator, manifold or water outlet.
1. Using Teflon Tape or suitable sealant install the
into the port on the vehicle.
2. Carefully thread the Thermostat Switch clockwise into the
now installed on the vehicle. Sealant such as loctite
can be used for permanent installation. (See Diagram #1)
DO NOT TIGHTEN THERMOSTAT WITH A WRENCH, HAND
TIGHTEN ONLY.
1. Taking into consideration probe placement and wire routing
requirements, choose a convenient location.
Avoid mounting near HOT engine components.
2. Using the relay bracket as a template, mark and drill a 5/32” hole in the
proper location.
3. Using the #10 Sheet Metal Screws provided, install the relay/wire harness.
3/8” NPT Thread-in
Probe
3/8” NPT
Thread-in Probe
KIT CONTENTS
QTY. DESCRIPTION
1 Thermostat Switch
1 Relay Wire Harness
1 3/8” NPT Thread-in Probe
4 4” Wire Ties
4 #10 Sheet Metal Screw
QTY. DESCRIPTION
1 Blue 5/16” Ring Terminal
3 Blue #10 Ring Terminal
2 Blue Butt Connectors
2 Blue Female Connectors
2 Blue Wire Tap Connectors
IMPORTANT
This single stage electric fan thermostat will
control up to two different fans with a
If fans exceed 25 amps combined we recommend
using one switch per fan.
COMBINED
MAXIMUM DRAW OF 25 CONTINUOUS AMPS.
Please read these instructions completely before beginning installation
TOOLS NEEDED
12V Test Light
Wire Stripper
Crimping Tool
3/4” Wrench
Teflon Tape
Standard Screw Driver
or a 5/16” Nut Driver
Drill
5/32” Drill Bit
WIRING
SINGLE FAN CONFIGURATION
DUAL FAN CONFIGURATION
Before starting, disconnect the Negative (-) cable on the vehicles battery.
Using the electrical connectors and wire ties provided, follow the directions below.
When extending wires always use the identical gauge wire as provided.
Using the Blue 5/16” Ring Terminal provided attach to the Positive (+) terminal of the battery.
Using the Blue #10 Ring Terminal and #10 Sheet Metal Screw provided attach to a good chassis ground (-).
Using the Blue Female Connector provided attach to EITHER of the terminals wires on the thermostat.
Using the Blue Wire Tap and Blue Female Connector provided attach the remaining Thermostat terminal to a
12V switched ignition source.
Attaching this wire directly to a 12V non-switched source will allow the fan to run after the vehicle has been turned off
which could effect the vehicles battery performance.
The green wire is designed to work in two different configurations. When used, this will allow the fan(s) to
be turned on regardless of the temperature of the thermostat as it simply overrides all other functions. If you choose to not use
this option disregard the wire.
1. A/C Override - Using the Blue Wire Tap provided, attach the green wire to the positive lead on the air conditioning compressor.
2. Manual Switch Override - Attach the Green Wire to the manual switch NOT PROVIDED.
For Manual Switch installation always follow manufactures instructions.
Using a Blue Butt Connector provided attach the Orange wire to the Positive (+) electric fan lead.
Using a #10 Blue Ring Terminal provided attach the Negative (-) electric fan lead to a good chassis ground (-).
Disregard, cut any exposed copper and tape or shrink wrap the end of the wire.
Using a Blue Butt Connector provided attach the Orange wire to the Positive (+) electric fan lead on fan #1.
Using a Blue Butt Connector provided attach the Blue wire to the Positive (+) electric fan lead on fan #2.
Using a #10 Blue Ring Terminal provided attach BOTH Negative (-) electric fan leads to a good chassis ground (-).
Reattach the Negative (-) cable on the vehicles battery.
WARNING:
Reference Diagrams # 2 & 3 on reverse side.
Red:
Black:
Yellow Wire:
Thermostat Wire:
Warning:
Green (Optional):
See Diagram #4 on reverse side.
Orange Wire:
Negative Fan Wire:
Blue Wire:
Fan #1
Orange Wire:
Fan #2
Blue Wire:
Negative Fan Wires: ,
Diagram #1
Thermostat
3/8” NPT
Brass Probe
3/8” NPT
Brass Probe
Water Jacket
(1 pages)
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